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Outlook 2011 for Mac "Mail could not be received at this time"

I'm having a problem which regards to this error "Mail could not be received at this time. The server for account
"company" returned the error "Logon failure: unknown user name or bad
password." Your username/password or security settings may be incorrect.
Would you like to try re-entering your password?"

I already read a lot of forums which might help me to resolve this issue but none of them fix the issue. Some says that the issue resides on the built in system program keychain on some other says its on the Outlook program configuration.

Here are the some steps I followed and applied, I tried deleting the keychain specifically for the Outlook login,
run the First Aid and fix it after though it didn't see any problem, I
also
even reset the whole Keychain system but none of this fixed the issue.
The last thing I did was re-installed the Outlook program itself.
Thought it fixed the issue until after a few weeks the user called again
informing me that the problem still occurs.

Could
someone please help me with this, any help will be very much appreciated.